Wet tumbling with SS pins peening necks

[patriotnation]

I have been using a wet tumbler for a while for reloading 6.5 creedmoor Lapua and Alpha brass. Has anyone else noticed the ends of the necks getting peened over? I am finding a bulge at the ends which is hard to deburr and if I don't it is giving me trouble chambering the rounds at times. I thought it was from letting them tumble too long so I shortened the time to an hour and it seems to help. I use Dawn and lemishine in one gallon of water and no more than 75-80 cases. I was told that once fired brass, if it is then chamfered and deburred, it should not need to be chamfered and deburred again, I am finding I am spending way too much time case prepping to the point of I am considering Ultrasonic instead but I am not familiar with that and hesitant to spend even more money since I started out with an RCBS corn cob tumbler then sprung for the Sinclair Thumbler tumbler. Trial and error is sure expensive.

 

[Backcountryguy]

Easy thing to check is tumble without the stainless pins...if it still peens, it’s not the pins.

I have to chamfer every time I load if I want to keep inside neck diameter consistent from case to case...but I don’t have to debur the outside edge.

Just something I’ve come to accept and it honestly doesn’t take long for me to chamfer. I just chuck the chamfer bit in my cordless drill and go to town on 100 or 200 at a time before priming the cases

 

[jcam]

I use SS pins as well.

I trim with Giraud once the cases are dry. Once trimmed the minimal peening goes away. I only use 2 teaspoons of dawn and I fill the container with water. I only tumble 100 brass at a time for 1 hour.

 

[427Cobra]

Simple easy fix is use a Giraud Trimmer to chamfer/trim the cases, but I found that Uber clean doesn’t shoot as good as just tumbled brass, the carbon inside the necks aids in consistent bullet release.

 

[918v]

Don’t load so many cases in the tumbler. Add more media.

 

[260284]

I, deprime, wet tumble without pins using Brass Juice. Then I re-size, trim on a Giraud, and then tumble in media to remove the case lube. If you are tumbling with pins, 30 minutes to an hr max will be easier on you case mouths.

 

[patriotnation]

thank you